US6473320B2 - Voltage converter circuit with self-oscillating half-bridge configuration and with protection against hard switching - Google Patents

Voltage converter circuit with self-oscillating half-bridge configuration and with protection against hard switching Download PDF

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US6473320B2
US6473320B2 US09/908,501 US90850101A US6473320B2 US 6473320 B2 US6473320 B2 US 6473320B2 US 90850101 A US90850101 A US 90850101A US 6473320 B2 US6473320 B2 US 6473320B2
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terminal
voltage
power switch
output node
switch
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US20020044466A1 (en
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Vincenzo Randazzo
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STMicroelectronics SRL
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2856—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5383—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a self-oscillating arrangement
    • H02M7/53832—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a self-oscillating arrangement in a push-pull arrangement
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the present invention regards a voltage converter circuit with self-oscillating half-bridge configuration and with protection against hard switching.
  • voltage converter circuits are used generally having a self-oscillating half-bridge configuration.
  • a voltage converter circuit 1 having a self-oscillating half-bridge configuration is shown in FIG. 1, and comprises first and second input terminals 2 a , 2 b (the second input terminal 2 b being connected to ground), between which an input voltage V in is supplied, and first and second output nodes 3 a , 3 b , between which an output voltage V out is supplied.
  • a capacitive divider 4 is connected between the pair of input terminals 2 a and 2 b and comprises a first capacitor 5 , having a capacitance C 1 , and a second capacitor 6 , having a capacitance C 2 connected in series.
  • first and second power switches 7 , 8 forming the two branches of the bridge.
  • first power switch 7 is connected between the first input terminal 2 a and the first output node 3 a (also referred to as “middle point”)
  • second power switch 8 is connected between the first output node 3 a and the second input terminal 2 b.
  • a resonant load 10 comprising a lamp 12 connected in parallel to a capacitor 13 and in series to an induction coil 14 .
  • Each of the power switches 7 , 8 has a respective control terminal 17 , 18 connected to output terminals of an integrated circuit 15 controlling, in phase opposition, the opening or closing of the power switches 7 , 8 .
  • the integrated circuit 15 controls closing of the first power switch 7 and opening of the second power switch 8
  • the first output node 3 a is connected to the first input terminal 2 a ; instead, when the integrated circuit 15 controls opening of the first power switch 7 and closing of the second power switch 8 , the first output node 3 a is connected to the second input terminal 2 b .
  • an alternating output voltage V out is obtained at a frequency determined by switching of the switches 7 , 8 and is controlled by the integrated circuit 15 .
  • FIG. 1 b is a schematic representation of a voltage converter circuit 100 comprising first and second oscillating circuits 101 , 102 , and a transformer 103 .
  • the first and second oscillating circuits 101 and 102 and the transformer 103 drive opening or closing of the power switches 7 , 8 to generate the oscillations of the voltage supplied to the load.
  • the first oscillating circuit 101 is connected in parallel to the first power switch 7 and is triggered by means of a first secondary winding 104 .
  • the second oscillating circuit 102 is connected in parallel to the second power switch 8 and is triggered by means of a second secondary winding 105 .
  • the secondary windings 104 , 105 are connected to the transformer 103 .
  • a DIAC device 106 is connected to the second power switch 8 and is used to initiate the voltage converter circuit 100 .
  • FIG. 1 c shows another known voltage converter circuit, designated by 200 and comprising an oscillating circuit 201 and a driving block 203 for controlling opening or closing of the power switches 7 , 8 .
  • the oscillating circuit 201 is connected to the first power switch 7 and is triggered by means of a secondary winding 202 , whilst the driving block 203 is directly connected to the second input terminal 2 b and to the second switch 8 , and is connected to the first power switch 7 by means of a level shifter 204 .
  • a DIAC device 206 is connected to the second power switch 8 and is used to initiate the voltage converter circuit 200 .
  • FIG. 1 d shows a further known voltage converter circuit, designated by 300 and comprising a first driving circuit 301 connected to the first power switch 7 and a second driving circuit 302 connected to the second power switch 8 .
  • Both driving circuits 301 , 302 are triggered by means of a respective secondary winding 303 , 304 .
  • the secondary windings 303 , 304 are connected to a saturable core transformer 305 , which in turn is connected to a resonant load 306 by means of a winding 307 .
  • a DIAC device 308 connected to the second power switch 8 is used to initiate the voltage converter circuit 300 .
  • the latter condition is satisfied by appropriately delaying switching on of the power switches.
  • switching off of the second power switch 8 generates a positive variation in the value of the voltage present on the output node 3 a .
  • This voltage after a rise time T r , depending on the value of the current flowing in the induction coil 14 and on the equivalent capacitance present on the output node 3 a , assumes the value of the voltage present on the first input terminal 2 a . Consequently, to satisfy the zero voltage switching condition, it is necessary to delay switching on of the first power switch 7 by a time at least equal to the rise time T r .
  • switching off of the first power switch 7 generates a negative variation in the value of the voltage present on the output node 3 a .
  • the latter voltage after a fall time T f , depending on the value of the current flowing in the induction coil 14 and on the value of the equivalent capacitance present on the output node 3 a , assumes the value of the voltage present on the second input terminal 2 b . Also in this case, then, to satisfy the zero voltage switching condition it is necessary to delay switching on of the second power switch 8 by a time at least equal to the fall time T f .
  • the delay is obtained by inserting a timing circuit inside the integrated circuit 15 (plus a few components outside the integrated circuit), whereas in the voltage converter circuits of FIGS. 1 b , 1 c and 1 d , the delay is normally obtained by means of an RC type network.
  • a voltage converter circuit is provided, which overcomes the limitations and drawbacks referred to above.
  • the voltage converter circuit has first and second input terminals; and first and second output nodes; a first power switch connected between the first input terminal and the first output node; a second power switch connected between the first output node and the second input terminal; a first delay circuit having first and second terminals connected between the first input terminal and a control terminal of the first power switch; and a second delay circuit having first and second terminals connected between the first output terminal and a control terminal of the second power switch.
  • Each delay circuit detects a variation in the voltage supplied on the respective first terminal and detects an operating condition of the respective power switch on the second terminal, and supplies to the control terminal of the respective power switch a switching on delay signal.
  • a method of operation of the voltage converter circuit includes delaying the closing of the first power switch in the event that the voltage at the first output node is not constant, or in the event that the second power switch is closed.
  • the method also includes delaying the closing of the second power switch in the event that the voltage at the first output node is not constant, or in the event that the first power switch is closed.
  • FIGS. 1 a , 1 b , 1 c and 1 d show simplified electrical diagrams of known voltage converter circuits
  • FIG. 2 shows a simplified electrical diagram of a voltage converter circuit according to the present invention
  • FIG. 3 is a schematic illustration of a portion of the voltage converter circuit of FIG. 2;
  • FIGS. 4 a and 4 b illustrate the portion of FIG. 3 in greater detail
  • FIG. 5 shows the plots of electrical quantities sampled on the circuit portion of FIG. 3.
  • FIG. 6 shows a cross section through a chip incorporating the voltage converter circuit of FIG. 2 .
  • FIG. 2 shows a voltage converter circuit 20 having a self-oscillating half-bridge configuration, presenting first and second input terminals 21 a , 21 b , between which an input voltage V in is applied, and first and second output nodes 22 a , 22 b , between which an output voltage V out is present.
  • the input voltage V in is a DC or low frequency AC voltage generated by a rectified network not illustrated in FIG. 2 .
  • a capacitive divider 23 is connected between the first input terminal 21 a and the second input terminal 21 b , and is formed by a first capacitor 24 having a capacitance C 4 and a second capacitor 25 having a capacitance C 3 of a value equal to that of capacitance C 4 .
  • the capacitors 24 , 25 are connected together in series and are called “snubber capacitors”.
  • the first capacitor 24 is connected between the first input terminal 21 a and the second output node 22 b
  • the second capacitor 25 is connected between the second output node 22 b and the second input terminal 21 b.
  • a first resistor 35 having a resistance R 1
  • a third capacitor 36 having a capacitance C 1
  • the first resistor 35 is connected between the first input terminal 21 a and the first intermediate node 37
  • the third capacitor 36 is connected between the first intermediate node 37 and the first output node 22 a.
  • a second resistor 40 having a resistance R 2
  • a fourth capacitor 42 having a capacitance C 2
  • the second resistor 40 is connected between the first input terminal 21 a and a second intermediate node 43
  • the fourth capacitor 42 is connected between the second intermediate node 43 and the second input terminal 21 b.
  • the voltage converter circuit 20 also comprises first and second circuit blocks 27 , 28 .
  • the first circuit block 27 has a first terminal, a second terminal, and a third terminal respectively connected to the first input terminal 21 a , the first output node 22 a , and the first intermediate node 37 .
  • the second circuit block 28 has a first terminal, a second terminal, and a third terminal respectively connected to the first output node 22 a , the second input terminal 21 b , and the second intermediate node 43 .
  • an electrical load 30 comprising, for example, a lamp 31 connected in parallel to a resonant capacitor 32 having a capacitance C R , and in series to a resonant induction coil 33 having an inductance L R .
  • a third resistor 45 having a resistance R 3 , is connected between the first output node 22 a and the second input terminal 21 b , and a discharge diode 46 is connected between the second intermediate node 43 and the first output node 22 a.
  • the first circuit block 27 comprises a first power switch 60 having a first terminal connected to the first input terminal 21 a of the voltage converter circuit 20 , a second terminal connected to the first output node 22 a of the voltage converter circuit, and a control terminal 61 .
  • a first driving circuit (or “driver”) 62 which is not shown in detail in FIG. 3 because it is known, is connected between the first intermediate node 37 and the first output node 22 a , and has an input terminal 63 receiving a control signal S generated by a control logic unit (not shown), and an output terminal connected to the control terminal 61 of the first power switch 60 .
  • the first circuit block 27 also comprises a delay circuit 64 connected to the first intermediate node 37 and having a first terminal 65 connected to the first input terminal 21 a of the voltage converter circuit 20 , and a second terminal 67 connected to the control terminal 61 of the first power switch 60 .
  • the first delay circuit 64 comprises a first voltage sensor 66 connected to the terminal 65 .
  • the second circuit block 28 comprises a second power switch 70 having a first terminal connected to the first output node 22 a of the voltage converter circuit 20 , a second terminal connected to the second input terminal 21 b of the voltage converter circuit, and a control terminal 71 .
  • a second driver 72 is connected between the second intermediate node 43 and the second input terminal 21 b , and has an input terminal 73 receiving the control signal S, and receiving a control signal D generated by a DIAC device 78 connected to the second intermediate node 43 .
  • the driver 72 moreover comprises an output terminal connected to the control terminal 71 of the second power switch 70 .
  • the second circuit block 28 also comprises a second delay circuit 74 connected to the second intermediate node 43 and having a first terminal 75 connected to the first output node 22 a , and a second terminal 77 connected to the control terminal 71 .
  • the second delay circuit 74 comprises a second voltage sensor 76 connected to the input terminal 75 .
  • FIG. 4 a is a detailed illustration of a preferred embodiment of the circuit block 27 , in which the first power switch 60 is a Darlington configuration Emitter Switch and comprises: a first power transistor 80 a , of the NPN type, having a first conduction terminal connected to the first input terminal 21 a of the voltage converter circuit 20 , a second conduction terminal, and a control terminal 81 a connected to the first driver 62 ; a second power transistor 82 a , which is also of the NPN type, having first and second conduction terminals respectively connected to the first input terminal 21 a and to the control terminal of the first power transistor 80 a , and a control terminal connected to the first driver 62 ; a third power transistor 83 a , of the NMOS type, having first and second conduction terminals respectively connected to the second conduction terminal of the first power transistor 80 a and to the first output node 22 a , and a control terminal connected to the first driver 62 ; and a freewheeling diode 84
  • the first voltage sensor 66 is made using VIPOWERTM technology and comprises a high voltage capacitor 86 a and a high voltage diode 87 a having its cathode connected to the first input terminal 21 a .
  • the high voltage diode 87 a is made up of a buried layer 501 of a P + type and an epitaxial layer 502 of an N ⁇ type, both formed inside a chip 500 made of semiconductor material embedding the voltage converter circuit 20 .
  • the high voltage capacitor 86 a is a parasitic component formed between an isolation region 503 of a P + type and a substrate 504 of an N + type.
  • the first voltage sensor 66 may be formed by a high voltage capacitor of a discrete type.
  • the delay circuit 64 comprises a Zener diode 90 a (present only if the high voltage capacitor 86 a is of the integrated type) having its anode connected to the anode of the high voltage diode 87 a and its cathode connected to the first intermediate node 37 by means of a first resistive element 91 a .
  • the delay circuit 64 further comprises: a first sensing transistor 92 a , of a PMOS type, having first and second conduction terminals respectively connected to the first intermediate node 37 and to a circuit node 93 a , and a control terminal connected to the cathode of the Zener diode 90 a ; a second sensing transistor 94 a , of an NMOS type, having a first conduction terminal connected to the first circuit node 93 a , a second conduction terminal connected to the first output node 22 a and a control terminal connected to the control terminal of the third power transistor 83 a and connected to the first output node 22 a by means of a second resistive element 95 a ; and a disabling transistor 96 a , of an NMOS type, having a first conduction terminal connected to the control terminal of the third power transistor 83 a to generate a switching on delay signal E, a second conduction terminal connected to the first output node 22 a , and a control terminal connected
  • FIG. 4 b is a detailed illustration of a preferred embodiment of the circuit block 28 , in which the second power switch 70 is a Darlington configuration Emitter Switch and comprises: a first power transistor 80 b , of the NPN type, having a first conduction terminal connected to the first output node 22 a of the voltage converter circuit 20 , a second conduction terminal, and a control terminal 81 b connected to the second driver 72 ; a second power transistor 82 b , which is also of the NPN type, having first and second conduction terminals respectively connected to the first output node 22 a and to the control terminal of the first power transistor 80 b , and a control terminal connected to the first driver 72 ; a third power transistor 83 b , of the NMOS type, having first and second conduction terminals respectively connected to the second conduction terminal of the first power transistor 80 b and to the second input terminal 21 b , and a control terminal connected to the first driver 72 ; and a freewheeling diode 84 b
  • the second voltage sensor 76 is made in the same way as the first voltage sensor 66 shown in FIG. 6 and comprises a high voltage capacitor 86 b and a high voltage diode 87 b having its cathode connected to the first output node 22 a .
  • the delay circuit 74 comprises a Zener diode 90 b (present only if the high voltage capacitor 86 b is of the integrated type) having its anode connected to the anode of the high voltage diode 87 b and its cathode connected to the second intermediate node 43 by means of a first resistive element 91 b .
  • the delay circuit 74 moreover comprises: a first sensing transistor 92 b , of the PMOS type, having first and second conduction terminals respectively connected to the second intermediate node 43 and to the circuit node 93 b , and a control terminal connected to the cathode of the Zener diode 90 b ; a second sensing transistor 94 b , of the NMOS type, having a first conduction terminal connected to the first circuit node 93 b , a second conduction terminal connected to the second input terminal 21 b , and a control terminal connected to the control terminal of the third power transistor 83 b and connected to the input terminal 21 b by means of a second resistive element 95 b ; and a disabling transistor 96 b , of the NMOS type, having a first conduction terminal connected to the control terminal of the third power transistor 83 b to generate the switching on delay signal E, a second conduction terminal connected to the second input terminal 21 b , and a control terminal connected to the circuit
  • first and second power switches 60 , 70 are switched off (i.e., the first power transistors 80 a , 80 b , the second power transistors 82 a , 82 b , and the third power transistors 83 a , 83 b are off), and the input voltage V in (dashed line in FIG. 5) and the voltage V MP present on the first output node 22 a (solid line in FIG. 5) are equal to a ground voltage (voltage on the second input terminal 21 b ).
  • the input voltage V in instant to, FIG.
  • the voltages V C1 and V C2 are, respectively, the supply voltages of the first circuit block 27 and of the second circuit block 28 supplied to the first and second intermediate nodes 37 , 43 .
  • first and second delay circuits 64 , 74 are both off (switching on delay signal E at a high logic level, FIG. 5) since no variation in the voltage V MP is detected and since first and second power switches 60 , 70 are off.
  • the voltage V C2 (dashed line in FIG. 5) reaches the triggering value V diac of the DIAC device 78 , which generates the control signal D by means of which it enables the second driver 72 to switch on the second power switch 70 .
  • the second driver 72 is enabled to supply appropriate base currents to the control terminals of the first power transistor 80 b and to the second power transistor 82 b , and to apply an appropriate voltage value to the control terminal of the third power transistor 83 b.
  • Switching on of the second power switch 70 generates a negative variation in the value of the voltage V MP and a consequent positive variation in the value of the voltage V in ⁇ V MP .
  • the positive variation in the voltage V in ⁇ V MP is detected by the first voltage sensor 66 and converted into a current generating, across the first resistive element 91 a , a voltage such as to maintain the first sensing transistor 92 a turned off. In these conditions, also the disabling transistor 96 a is off and maintains the first delay circuit 64 off.
  • the second voltage sensor 76 detects the negative variation in the value of the voltage V MP and converts it into a current generating, across the first resistive element 91 b , a voltage such as to cause turning on of the first sensing transistor 92 b .
  • Turning on of the first sensing transistor 92 b generates a current I 1 b (FIG. 5) producing, across the third resistive element 97 b , a voltage such as to enable turning on of the disabling transistor 96 b .
  • the disabling transistor 96 b cannot turn on.
  • turning on of the third power transistor 83 b generates a current 12 b (FIG. 5) producing, across the second resistive element 95 b , a voltage such as to cause turning on of the second sensing transistor 94 b , which maintains the disabling transistor 96 b off, and hence deactivates the second delay circuit 74 .
  • the second power switch 70 remains switched on, thus enabling correct start-up of the oscillations of the voltage converter circuit 20 .
  • the second sensing transistor 94 b and the second resistive element 95 b are not present, as soon as the second driver 74 switches on the second power switch 70 , there is a negative variation in the value of the voltage V MP , causing turning on of the first sensing transistor 94 b and consequently turning on of the disabling transistor 96 b , which turns off the second power switch 70 .
  • the DIAC device 78 again switches on the second power switch 70 , and the voltage converter circuit 20 enters a loop which does not allow it to oscillate.
  • the presence of the second sensing transistor 94 b and of the second resistive element 95 b prevents the voltage converter circuit 20 from entering this loop. Furthermore, it may happen that the current flowing in the induction coil 33 is extinguished before the voltage V MP goes to zero. In this condition, in order to send the voltage V MP to zero, and hence enable the voltage converter circuit 20 to oscillate, it is necessary to switch on the power switch even when a high voltage is present across it. This is made possible thanks to the presence of the second sensing transistors 94 a , 94 b and to the presence of the second resistive elements 95 a , 95 b.
  • the control logic unit In the instant t 4 , the control logic unit generates the control signal S enabling the second driver 72 to switch off the second power switch 70 . This causes a positive variation in the value of the voltage V MP , owing to the fact that current continues to pass to the electrical load 30 , and a consequent negative variation in the value of the voltage V in ⁇ V MP .
  • the positive variation in the voltage V MP is detected by the second voltage sensor 76 and converted into a current generating, across the first resistive element 91 b , a voltage such as to maintain the first sensing transistor 92 b off. In these conditions, also the disabling transistor 96 b is off and maintains the second delay circuit 74 off.
  • the first voltage sensor 66 detects the negative variation in the value of the voltage V in ⁇ V MP and converts it into a current generating, across the first resistive element 91 a , a voltage such as to cause turning on of the first sensing transistor 92 a .
  • Turning on of the first sensing transistor 92 a generates a current I 1 a (not shown in FIG. 5) producing, across the third resistive element 97 a , a voltage such as to cause turning on of the disabling transistor 96 a , which generates the switching on delay signal E at a low logic level (FIG. 5 ), so controlling switching off of the first power switch 60 .
  • the second sensing transistor 94 a and the second resistive element 95 a do not intervene because the third power transistor 83 a is off.
  • the first delay circuit 64 maintains the first power switch 60 off until the negative variation in the voltage V in ⁇ V MP ceases (instant t 5 , FIG. 5 ), after which it turns off in so far as it no longer detects any variation in this voltage and in so far as the third power transistor 83 a is off. In these conditions, the first driver 62 controls switching on of the first power switch 60 . Between the instants t 5 and t 6 the regular “ON” phase of the first power switch 60 takes place and the voltage V MP goes to the value of the input voltage V in .
  • control logic unit generates another control signal S and enables the first driver 62 to switch off the first power switch 60 .
  • This causes a negative variation in the value of the voltage V MP and a consequent positive variation in the value of the voltage V in ⁇ V MP .
  • the control logic unit generates another control signal S immediately after start of the negative variation in the voltage V MP , thus enabling the second driver 72 to switch on the second power switch 70 (instant t 6 , FIG. 5 ).
  • the second voltage sensor 76 detects the negative variation in the value of the voltage V MP and converts it into a current generating, across the first resistive element 91 b , a voltage such as to cause turning on of the first sensing transistor 92 b .
  • Turning on of the first sensing transistor 92 b generates a current I 1 b producing, across the third resistive element 97 b , a voltage such as to turn on the disabling transistor 96 b , which keeps the second power switch 70 off.
  • the second sensing transistor 94 b and the second resistive element 95 b do not intervene because the third power transistor 83 b is off.
  • the second delay circuit 74 maintains the second power switch 70 off until the negative variation in the voltage V MP ceases, after which it turns off in so far as it no longer detects any variation in this voltage and in so far as the third power transistor 83 b is off (instant t 7 , switching on delay signal E at a high logic level).
  • the second driver 72 controls switching on of the second power switch 70 .
  • the “ON” phase of the second power switch 70 takes place regularly, with consequent sending to zero of the voltage V MP .
  • the voltage converter circuit 20 continues to oscillate between the two conditions described above, appropriately delaying switching on of the power switches 60 , 70 so as to prevent them from switching on when the voltage across them is still high.
  • the voltage converter circuit according to the invention generates a delay depending exclusively on the pattern of the voltage present on the first output node 22 a , guaranteeing switching on of the power switches only after the end of the variations in this voltage. This means that the zero voltage switching condition continues to be respected even though there is a change in the values of the capacitances C 1 and C 2 , on which depends the value of the equivalent capacitance present on the first output node 22 a and/or the value of the inductance associated to the load.
  • the voltage converter circuit according to the present invention may be used with all the known solutions previously described and for driving any type of load.

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  • Dc-Dc Converters (AREA)
US09/908,501 2000-07-17 2001-07-17 Voltage converter circuit with self-oscillating half-bridge configuration and with protection against hard switching Expired - Lifetime US6473320B2 (en)

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EP00830497 2000-07-17
EP00830497.4 2000-07-17
EP00830497A EP1176707B1 (fr) 2000-07-17 2000-07-17 Circuit de convertisseur de tension avec demipoint resonant independement et protéction contre commutation dure

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US20040027760A1 (en) * 2000-11-14 2004-02-12 Yves Villaret System and method to eliminate the dead time influence in a pwm-driven system
US20040120090A1 (en) * 2002-10-31 2004-06-24 International Rectifier Corporation Half-bridge high voltage gate driver providing protectin of a transistor
US20050068089A1 (en) * 2003-09-30 2005-03-31 Balu Balakrishnan Method and apparatus for simplifying the control of a switch
US20100214506A1 (en) * 2007-10-16 2010-08-26 Gaides Gary E Higher transmission light control film
US10389260B2 (en) 2016-04-14 2019-08-20 Signify Holding B.V. Half bridge resonant converters, circuits using them, and corresponding control methods

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EP1176707A1 (fr) 2002-01-30
EP1176707B1 (fr) 2003-05-14
DE60002712D1 (de) 2003-06-18

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